A canal was performed on one of my front teeth a year ago. After the procedure, a crown
was fitted on. Recently, I noticed that I have a dry mouth and a bad breath. It's coming from the
gum above the crown. I can even smell it from the floss that I used on the crowned tooth. Does
the crown cause or is there a decay under the crown that they didn't see during the
root canal treatment? How can I get rid of the bad breath?